Lawn mower and the like



G. F. BULL. LAWN MOWER AND THE-LIKE. APPLICATION FILED JULY 8. 1921.

I 1,416,784. v Patented M y23,1922.

Arum M z ealye fiedera' l B units stares earenrorieice.

GEORGE E. BULL, OE BIRMINGHAIVI, ENGLAND, I.SSIGI\TOR O}? ONE-HALF TOCHARLES H. PUGH, LIIVII'IED. G1? BIB-IVHNGHALL ENGLAND.

LAWN MOWER AND THE LIKE.

Specification 01 Letters Retent.

Patented May 23, 1922.

Application. filed July 8, 1921. Serial No. 483,126.

To (ZZZ iii/607R it may concern:

Be it known that 1, Greece l nunnmcii BULL subject ofthe King of GreatBritain, residing at Birmingham, England, have invented certain new anduseful Improvements in Lawn Idowers and the like, 0t which the followingis a specification.

This invention relates to lawn mowers and the like. oi that typecomprising a nun'iber oi re ."olving cutter-blades carried by spacingdiscs mounted upon a central spindle.

The object of the present invention is to provide improved and moreetlicient means For securing the blades to the spacing discs.

The invention consists essentially in torming the spacing discs with aseries oi slots with which the blades are engaged, and in displacing themetal of the discs adjacent to the edges of the slots against the sidesoi the l. lades. so that the latter are rigidly secured in position. Theblades may be either iorm l with parallel or with taper sides and theslots shaped to correspond; or a taper-sided blade may be fitted withina parallel-sided slot, and the metal adjacent to the slot closed againstthe sides oi. the blade. In case where a taper-sided blade is employedthe thicker portioi'i oi the blade is arranged to form the inner ornoncutting edge.

Figure 1 of the accompanying drawings represents an elevatio-nal view ofa series oi cutting blades fixed to the spacing discs in accordance withthis lHVtHltlOI'I, the blades being formed with parallel sides and engaging with parallel-sidiul slots in the said discs.

Figure 2 is a cross-section on the line 2-2 Figure 1, upon a largerscale.

Figure 3 shows a longitudinal section through the end of one oi? theblades, and through one of the spacing discs.

Figure l: shows one of the blades in the act of being eng ed with theslot in the spacing disc. the said blade being shown in (Toss-section.

Figure 5 represents an alternative method in which the blade is formedwith taper sides and is engaged with a parallel sided slot in thespacing disc, showing the slot prior to the metal adjustment to thesides of the same being forced against the sides of the blade.

Figure 6 is a view oi this alternative method after the metal adjacentto the sides or the slot has been forced against the blade. l igurc 4represents a longitudinal section through one end of a blade which isformed 1 uretal at each side oi the slot in the spacing disc is forced.

Figure 8 is a section on 89 Figure 7.

Figure 9 shows an arrangement in which both the slot and the blades areformed with taper sides, the blade being engaged with the slot endwise.

The same reference numerals indicate corresponding parts in each oi thefigures.

Referring to Figures 1 to at oi the drawings, the cutter comprises aseries of curved blades l arranged spirall around a central spindle 2.fiat rectangular cross-section and are carried at intervals in theirlength by spacing discs rigidly fixed to the spindle 2. Each oi thediscs 3 is formed with a number of radial parallel sided slots 4:(Figure 4) corresponding to the number oi blades, and of a widthapproximately equal to the thickness oi the blades. the said slots beingarranged at equal distances apart and extending to the outer peripheryof the disc, as shown. Each of the blades 1 is engaged with therespective slots in the disc 3 so that its cutting edge is presentedoutwards, the slots being oi? a length slightly less than the width oithe blade so that the cutting edge projects beyond the outer peripheryoi the discs. After the blades have been engaged within the slots in thesupporting discs the metal oi the discs adjacent to the sides or edgesoi the slots is displaced so that it is closed against the sides oi theblades. thus rigidly securing the latter in position.

Referring to Figures 5 and 6, instead of the blades 1. being of auniform cross-section as above described they may be formed with tapersides, the thicker portion of the blade forming the rear edge, as shown.The slots 4: in the supporting discs 3 are formed with parallel sides,the blades 1 being engaged with the respective slots, when the metaladjacent to the sides of the latter is displaced against the sides ofthe blades in a similar manner to the above described.

If desired the blades 1 may be formed with recesses 5 at points whichcome adjacent to the sides of theslot-s in the discs 3 when the saidblades are fitted in position.

The blades 1 are of a uniiornr The metal displaced from the sides of theslots is thus forced into the recesses 5 and serve to lock the bladesfirmly in place, as shown in Figures 7 and 8.

As shown in Figure 9, both the blade 1 and the slot 3 may be of a taperformation. In this case the blades are engaged endwise with the slot,and then secured, by displacing the metal at the sides of the slots.

If desired one side only of the blade may be inclined, the blade. beingeither engaged with correspondingly shaped slots, or with parallel sidedslots.

Having fully described my invention What I desire to claim and secure byLetters Patent is 1. A. lawn mower comprising a number of revolvingcutter-blades, spacing discs carrying the said blades and having slots 1therein with which the blades are engaged,

and means for securing the blades in the slots, the said meansconsisting of the metal of the discs adjacent the slots displacedagainst the sides of the blades so as to hold v the latter securely andfirmly in position.

2. A. lawnmower comprising a number of parallel-sides revolvingcutter-blades, spacing discs carrying the said blades and havingparallel-sided slots therein with which the blades are engaged, andmeans for securing the blades in the slots, the said means consisting ofthe metal of the discs ad acent the slots displaced against the sides ofthe blades so as to hold the latter securely and rying the saidbladesand having slots there in with which the blades are engaged, means,

for securing the blades in the slots, the said means consisting of themetal of the discs adjacent the slots displaced against the sides of theblades and into recesses formed in the latter adjacent the slots, so asto lock the blades securely and lirmly in position.

4-. A lawn-mower comprising a number of parallel-sided revolvingcutter-blades, spacing discs carrying the said blades and havingparallebsided slots therein with which the blades are engaged, means forsecuring the blades in theislots, the said means consisting of the metalof the discs adjacent the slots displaced against the sides of theblades and into recesses formed in the latter adjacent the slots, so asto lock the blades securely and firmly in position.

In testimony whereof I have hereunto set my hand in presence of. twosubscribing witnesses.

GEO. F. BULL.

Witnesses l/V. L. SKERRETT, W. V. SKERRETT.

